GC-3005B Ultrasonic Distance Measurer（With laser pointer）1. Three memories for length,width,and height2. Adds and subtracts between the stored datas.3. One touch of calculation of volume and area4. Measures form 2ft-60ft(0.61-18.30m)5. Meter or feet conversion6. Accuracy : +/-0.5%±1 digit7. Auto power off 8. Back-light for use in darkness9. Low battery indication10. One 9v battery require